- Dec 15, 2011
- Z68MX-UD2H-B3, DQ77KB, NUC DC53427HYE, NUC D54250WYKH
- i5-2500K, i3-3225, i7-3770S
- HD 3000, HD 4000, HD 5000
- Classic Mac
- Mobile Phone
I had thought of this to, my only concern is any additional noise introduced, or picked up by addition of relay will be amplified potentially into audio range. At least with switching on output of the amplifier noise shouldn't be an issue.
I think this will be no problem, because those TAKAMISAWA relays are designed for audio applications. I've also used them in my DIY HiFi amplifier as input selector. Works fine and the sound quality is superb:
I am also concerned with, but haven't resolved, seperate of Gnd planes between audio, and arduino sections of the PCB, don't want all the pwm signals to cross over into the audio circuit
Good, if possible. But not really an issue, as long as you have a heavy GND connection between the NUC and the SMC board.
This leads to a bigger problem with my pcb layout, the main AMP and the chime are not in close proximity to one another. If I remove the lm317 regular from my design, then get some more flexibility, but I cannot see an obvious basic layout, that is small and keeps audio seperate
Why did you change the audio amp? You will loose the available area below it. You could mount the LM317 vertically. Or use BJT transistors without heatsink (driven in PWM mode instead in linear mode, so no heatsink is needed).
I have ordered a scope, see "eevblog #703", an overkill proberly
I think it's a good choice. I would like to have one too...
I've tried all that. It never worked in context with the SMC sketch. I guess, for example because there are while loops inside the CapacitiveSensor library. If I remember correctly, servo judder was a problem and serial communication did not work properly. Maybe I'm just too stupid...